spacecruft
/
celestia
1
0
Fork 0
Code Issues Pull Requests Projects Releases Wiki Activity

Incorporate OS-independent light-travel delay scheme

ver1_5_1
Fridger Schrempp 2003-01-26 22:13:15 +00:00
parent d8443843d4
commit 9a5c4aa417
2 changed files with 80 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

78
src/celestia/celestiacore.cpp
View File

@ -688,6 +688,65 @@ void CelestiaCore::charEntered(char c)
case '*':
addToHistory();
sim->reverseObserverOrientation();
sim->setTargetSpeed(-sim->getTargetSpeed());
break;
case '?':
addToHistory();
if (!sim->getSelection().empty())
{
Vec3d v = sim->getSelection().getPosition(sim->getTime()) -
sim->getObserver().getPosition();
int hours, mins;
float secs;
char buf[128];
if (astro::microLightYearsToKilometers(v.length()) >=
86400.0 * astro::speedOfLight)
{
// Light travel time in years, if >= 1day
sprintf(buf,"Light travel time: %.4f yr ",
v.length() * 1.0e-6);
flash(buf, 2.0);
}
else
{
// If Light travel delay < 1 day, display in [ hr : min : sec ]
getLightTravelDelay(v.length(), hours, mins, secs);
if (hours == 0)
sprintf(buf,"Light travel time: %d min %.1f s",
mins, secs);
else
sprintf(buf,"Light travel time: %d h %d min %.1f s"
,hours, mins, secs);
flash(buf, 2.0);
}
}
break;
case '-':
addToHistory();
if (sim->getSelection().body)
{
Vec3d v = sim->getSelection().getPosition(sim->getTime()) -
sim->getObserver().getPosition();
int hours, mins;
float secs;
char buf[128];
if (astro::microLightYearsToKilometers(v.length()) <
86400.0 * astro::speedOfLight)
{
// If Light travel delay < 1 day, display in [ hr : min : sec ]
getLightTravelDelay(v.length(), hours, mins, secs);
if (hours == 0)
sprintf(buf,"Light travel time: %d min %.1f s subtracted",
mins, secs);
else
sprintf(buf,"Light travel time: %d h %d min %.1f s subtracted"
,hours, mins, secs);
flash(buf, 2.0);
setLightTravelDelay(v.length());
}
}
break;
case ',':
@ -993,6 +1052,25 @@ void CelestiaCore::charEntered(char c)
}
}
void CelestiaCore::getLightTravelDelay(double distance, int& hours, int& mins,
float& secs)
{
// light travel time in hours
double lt = astro::microLightYearsToKilometers(distance)/
(3600.0 * astro::speedOfLight);
hours = (int) lt;
double mm = (lt - hours) * 60;
mins = (int) mm;
secs = (float) ((mm - mins) * 60);
}
void CelestiaCore::setLightTravelDelay(double distance)
{
// light travel time in days
double lt = astro::microLightYearsToKilometers(distance)/
(86400.0 * astro::speedOfLight);
sim->setTime(sim->getTime() - lt);
}
void CelestiaCore::start(double t)
{

2
src/celestia/celestiacore.h
View File

@ -121,6 +121,8 @@ class CelestiaCore // : public Watchable<CelestiaCore>
bool initSimulation();
bool initRenderer();
void start(double t);
void getLightTravelDelay(double distance, int&, int&, float&);
void setLightTravelDelay(double distance);
// URLs and history navigation
void setStartURL(std::string url);